• An intense, focused absorption that makes you lose all sense of time.
• ‘Autotelicity’; a sense that the activity is its own reward.
• The ‘sweet spot’; the feeling that your skills are perfectly matched to the activity, and there is no boredom or frustration.
• And what most stands out for 'automaticity’; that the tennis racket just moves by itself."
From my book - http://www.lulu.com/.../paperback/product-22440822.html